The biggest addition to OpenWFEru 0.9.4 is the CsvParticipant. It's a way of encapsulating decisions within CSV tables. It's described at
http://jmettraux.wordpress.com/2007/02/11/ruby-decision-tables/

As for the scheduler you can use the CsvTable out of OpenWFEru.

The 'when' and the 'iterator' expressions got implemented. 'when' is especially important to trigger subprocesses when a condition realizes later in time.

The expression pool (the heart of the process execution engine) has been made observable, the first component to benefit of this is a History log system.

The documentation at http://openwferu.rubyforge.org is growing.